三缸机车型起动振动的分析与控制

Analysis and Control of Starting Vibration of the Vehicle Equipped with a 3-cylinder Engine

针对某三缸机车型起动过程中振动过大问题开展研究。分析三缸机起动过程中受到的主要激励及其从动力总成到车身的传递关系。结果表明:起动过程中燃烧产生的扭矩波动通过悬置系统传递到车身是导致起动振动主要原因。三缸机起动过程中扭矩波动大,且其动力总成悬置系更容易产生模态耦合现象,从而易导致三缸机车型起动振动更为明显。通过优化动力总成悬置系统,降低扭矩波动到车身的传递以及提高电机拖动转速,降低起动初期扭矩波动,起动振动得到明显抑制,使车辆达到标杆车水平。

The problem of overlarge starting vibration of a car equipped with a 3-cylinder engine was studied.The characteristics of excitation and vibration transfer path from the powertrain to the car body in the starting process of the 3-cylinder car were analyzed.Research results show that the starting vibration is induced by the torque fluctuations of the engine which transfer from mounting system to car body.The large torque fluctuations induced by combustion during starting and the mode couple of the mounting system of the 3-cylindered engine result in overlarge vibration.By reducing the torque fluctuation though starting procedure optimization and minimizing its transfer by mounting system optimization,the starting vibration was effectively abated.